In this paper, a second-order system affected by perturbations is considered. A feedback control law adopting the continuous twisting algorithm is designed such that a saturated and continuous control signal is introd...
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This paper proposes an entirely new discrete-time realization of an arbitrary order robust exact differentiator. Its construction relies on the redesign of the differentiator in the discrete-time domain by means of a ...
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This paper proposes an entirely new discrete-time realization of an arbitrary order robust exact differentiator. Its construction relies on the redesign of the differentiator in the discrete-time domain by means of a non-linear eigenvalue placement. The resulting algorithm is consistent with the continuous-time algorithm and preserves the best possible asymptotic accuracies known from the continuous-time differentiator. In contrast to the existing discretization schemes, the proposed schemes are exact in the sense that in the unperturbed case the differentiators ensure vanishing estimation errors. Limit cycles typically present in the error state variables enforced by the forward Euler discretized algorithm are avoided and the precision is insensitive to an overestimation of the gains.
This paper presents an approach for developing transient strategies for multi-cylinder gas engines using only a single cylinder in a hardware-in-the-loop setup. Engine components that are physically not present are re...
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This paper presents an approach for developing transient strategies for multi-cylinder gas engines using only a single cylinder in a hardware-in-the-loop setup. Engine components that are physically not present are replaced by a real-time model. The model generates pressure and speed trajectories, which are applied to the single-cylinder engine to ensure that its behavior is identical to its operation as part of the multi-cylinder engine. Design and analysis of two of the controllers used for that purpose are discussed. For the control of the charge air pressure, a concept based on nonlinear decoupling and a strategy maximizing the actuator range available for disturbance rejection is presented. To control the fuel gas pressure, a linear plant model is obtained and a controller motivated by stability conditions is proposed.
In this paper, a second-order system affected by perturbations is considered. A feedback control law adopting the continuous twisting algorithm is designed such that a saturated and continuous control signal is introd...
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In this paper, a second-order system affected by perturbations is considered. A feedback control law adopting the continuous twisting algorithm is designed such that a saturated and continuous control signal is introduced to the system. In the case that a state variable is not measurable, estimate information obtained through a super-twisting observer is incorporated into the design. For the closed-loops (with and without observer), global finite-time stability properties are established. The feasibility and effectiveness of the strategy is shown employing numerical simulations.
This paper presents a new release of A Robust Exact Differentiator Toolbox for Matlab ® /Simulink ® proposed in [1]. This release features a new discrete-time realization of the continuous-time robust exact...
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This paper presents a new release of A Robust Exact Differentiator Toolbox for Matlab ® /Simulink ® proposed in [1]. This release features a new discrete-time realization of the continuous-time robust exact differentiator. The implemented discretization scheme is less sensitive to gain overestimation and does not suffer from the discretization chattering effect. Hence, the single tuning parameter of the new version of the implemented differentiator is more intuitive to tune. Furthermore, it shows superior estimation performance in the case of large sampling times in comparison to the previous release. This is confirmed by the presented results obtained by numerical simulations and a real world application.
Geosciences data vary in a wide spectrum of types/attributes (hundred thousands of data classes) in extra huge volumes (Hundreds of PB's and ZB's) with the complexity of the format/media and versions in additi...
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Geosciences data vary in a wide spectrum of types/attributes (hundred thousands of data classes) in extra huge volumes (Hundreds of PB's and ZB's) with the complexity of the format/media and versions in addition to the dissemination in different DB's/applications. The current exponential data growth rate “DGR” is >100 PB just in a couple of years. Managing and validating such data is a challenge and complex. The concept of validation through the integration triangle (Technology, People & Best Practices) has been implemented in our project to close the data validation gaps and to eliminate the conventional data issues that represents a hindrance in the interpretation that badly affects the decision time and effectiveness. We used a standard queries and scripts for data mining/analysis to highlight the gaps, duplication/redundancy, inconsistency, incomplete record or attribute, conflict, typing mistakes, naming issues, nonstandard records and any other data issues. The best industry standards and the naming conventions have been applied to the Database in order to have a clean, consistent, complete, standard, unique object and authenticated data sets that complies with the aforementioned standards. During the planning phase, we studied many cases, then started with a pilot and detect the weakness / bottlenecks that may represent any obstacles during the full implementation. based on that we expected other issues and we put the suggested solution for each. This why it ran seamlessly in the final phase. The implementation of the project took place through the following: 1. Data analysis / mining to quantify the data issues in exact numbers and statistics. 2. Use the best workflows in the industry 3. Standard processes and business rules 4. Sealed data governance strategy. 5. Optimum technology utilization 6. Update and then repeat the cycle again periodically. The E&P Information Management Team is committed to keep the project updated in a continuous improvement phase,
In this paper, an extended Luenberger observer for a class of semilinear hyperbolic PIDEs is proposed to solve the problem of state estimation. The nonlinear observer error dynamics is linearized and then stabilized l...
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This paper presents transient numerical simulations of hydraulic systems in engineering applications using the spectral element method (SEM). Along with a detailed description of the underlying numerical method, it is...
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